U.S. patent number 7,753,076 [Application Number 11/626,048] was granted by the patent office on 2010-07-13 for electromagnetic valve.
This patent grant is currently assigned to SMC Corporation. Invention is credited to Minehiko Mita.
United States Patent |
7,753,076 |
Mita |
July 13, 2010 |
Electromagnetic valve
Abstract
A feeder terminal connected to the core wire of the feeder cable
is installed in the storage chamber of the terminal storage box,
and the feeder cable and the feeder terminal are gripped to be
fixed between the terminal storage box and the lid such that the
feeder socket is assembled. The feeder socket is inserted into the
socket hole formed in the terminal cover to connect the feeder
terminal to the power receiving terminal communicated with the
electromagnetic operation unit.
Inventors: |
Mita; Minehiko (Tsukubamirai,
JP) |
Assignee: |
SMC Corporation (Tokyo,
JP)
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Family
ID: |
38282422 |
Appl.
No.: |
11/626,048 |
Filed: |
January 23, 2007 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20070178753 A1 |
Aug 2, 2007 |
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Foreign Application Priority Data
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Jan 30, 2006 [JP] |
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2006-021224 |
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Current U.S.
Class: |
137/625.64;
439/687; 439/465; 439/353; 439/696; 439/357 |
Current CPC
Class: |
H01R
13/582 (20130101); H01R 24/20 (20130101); H01R
13/506 (20130101); H01R 13/6273 (20130101); H01R
24/66 (20130101); H01R 4/183 (20130101); Y10T
137/86614 (20150401); H01R 2103/00 (20130101) |
Current International
Class: |
F15B
13/043 (20060101) |
Field of
Search: |
;137/625.64,625.65,884
;439/696,465,687,353,357,378,76.1,76.2 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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1128418 |
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Aug 1996 |
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CN |
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62-3909 |
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Jan 1987 |
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JP |
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7-335305 |
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Dec 1995 |
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JP |
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10-0354449 |
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Dec 2002 |
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KR |
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10-2004-0095729 |
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Nov 2004 |
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KR |
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20-0404077 |
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Dec 2005 |
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KR |
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Primary Examiner: Rivell; John
Assistant Examiner: Schneider; Craig M
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier
& Neustadt, L.L.P.
Claims
The invention claimed is:
1. An electromagnetic valve including an electromagnetic valve body
formed of a passage switching unit and an electromagnetic operation
unit for operating the passage switching unit, and a feeder unit
for supplying power to the electromagnetic operation unit,
characterized in that: the feeder unit includes a power receiving
terminal which is provided on a side surface of the electromagnetic
valve body and conducted to the electromagnetic operation unit, a
terminal cover attached onto the side surface of the
electromagnetic valve body to cover the power receiving terminal, a
socket hole formed at a position corresponding to the power
receiving terminal covered by the terminal cover, and a feeder
socket attached to a top end of a feeder cable so as to be
installed within the socket hole; the feeder socket includes a
terminal storage box having a rectangular box shape and an open
front surface and a lid for covering the open front surface of the
terminal storage box, and the feeder cable and a feeder terminal
are interposed between the terminal storage box and the lid which
are connected with each other to integrally assemble the feeder
socket to be installed within the socket hole such that the feeder
terminal and the power receiving terminal are electrically coupled
with each other; at least one of a plurality of walls surrounding
the socket hole is formed as an elastic wall including a top end
section located at the side of an inlet of the socket hole located
at an outer surface of the terminal cover and a tip section located
at the depth side remote from the outer surface of the terminal
cover; and a hook is formed on an inner surface of the tip section
of the elastic wall, and a claw is formed on a plane opposite the
elastic wall such that the feeder socket is installed in the socket
hole so as not to be fallen out through an elastic engagement
between the claw and the hook.
2. The electromagnetic valve according to claim 1, characterized in
that semi-circular grooves are formed at opposite positions for
introducing the feeder cable on the terminal storage box and the
lid such that the feeder cable is gripped between the semi-circular
grooves.
3. The electromagnetic valve according to claim 1, characterized in
that a protrusion formed at one of the terminal storage box and the
lid is fixed to a fixing window formed at the other one such that
they are integrally connected with each other.
4. The electromagnetic valve according to claim 2, characterized in
that a protrusion formed at one of the terminal storage box and the
lid is fixed to a fixing window formed at the other one such that
they are integrally connected with each other.
5. The electromagnetic valve according to claim 3, characterized in
that the terminal storage box includes left and right elastically
deformable side walls and a plurality of fixing windows formed on
the side walls, and the lid is elastically fit with a portion
between the left and the right side walls such that a plurality of
the protrusions formed on both side surfaces of the lid are fixed
to the fixing windows.
6. The electromagnetic valve according to claim 4, characterized in
that the terminal storage box includes left and right elastically
deformable side walls and a plurality of fixing windows formed on
the side walls, and the lid is elastically fit with a portion
between the left and the right side walls such that a plurality of
the protrusions formed on both side surfaces of the lid are fixed
to the fixing windows.
7. The electromagnetic valve according to claim 1, characterized in
that two opposite walls of the socket hole are formed as the
elastic walls, and the claws are formed on back surfaces of the
terminal storage box and the lid of the feeder socket,
respectively.
8. The electromagnetic valve according to claim 1, characterized in
that the elastic walls extend to a depth of the hole from an end
portion at the inlet side of the socket hole as a supporting point,
and an end portion at the depth side is made elastically deformable
to be close to or remote from the claws of the feeder socket.
9. The electromagnetic valve according to claim 1, characterized in
that a stepped portion is formed to surround the top end of the
socket hole, and flange portions are formed around an outer
periphery of the top end of the feeder socket such that the flange
portions abut against the stepped portion to be fixed upon
insertion of the feeder socket into the socket hole.
10. The electromagnetic valve according to claim 3, characterized
in that a stepped portion is formed to surround the top end of the
socket hole, and flange portions are formed around an outer
periphery of the top end of the feeder socket such that the flange
portions abut against the stepped portion to be fixed upon
insertion of the feeder socket into the socket hole.
Description
TECHNICAL FIELD
The present invention relates to an electromagnetic valve provided
with a passage switching unit that switches a fluid passage, an
electromagnetic operation unit that operates the passage switching
unit, and a feeder unit that applies electric current to the
electromagnetic operation unit.
BACKGROUND ART
An electromagnetic valve provided with a passage switching unit
that includes a valve body to switch the fluid passage, an
electromagnetic operation unit that includes a movable iron core
and a magnetizing coil for operating the valve body, and a feeder
unit that supplies electric current to the magnetizing coil has
been well known.
For example, Patent Document 1 discloses the feeder unit of the
electromagnetic valve in which a top end of the core wire of the
feeder cable is connected to a tubular terminal through pressure
bonding, and the tubular terminal and the feeder cable are inserted
into a terminal storage hole formed in a body of a terminal box
(feeder socket) so as to be assembled. The assembled feeder socket
is attached to a socket mount on the side surface of the
electromagnetic valve so as to be conducted to the feeder cable by
fitting the tubular terminal with a coil terminal that protrudes
from the socket mount.
In the aforementioned generally employed feeder unit as disclosed
in Patent Document 1, the feeder socket is assembled by inserting
the terminal or the feeder cable into a hole or a cylinder formed
in a body of the box, which requires manual operations as the
relatively difficult and time consuming work. Patent Document 1:
Utility Model Application Publication No. S62-3909
DISCLOSURE OF INVENTION
An object of the present invention is basically to simplify
assembly of a feeder unit for feeding power to the electromagnetic
operation unit, and attachment of the feeder unit to the
electromagnetic valve.
Another object of the present invention is to simplify assembly of
the feeder socket of the feeder unit and connection thereof to the
electromagnetic valve by interposing to fix the feeder cable and
the feeder terminal linked therewith between the terminal storage
box and the lid without external insertion into the hole or the
cylinder formed in the socket in the generally employed feeder
unit.
In order to solve the aforementioned problem, the electromagnetic
valve according to the present invention includes an
electromagnetic valve body formed of a passage switching unit and
an electromagnetic operation unit for operating the passage
switching unit, and a feeder unit for supplying power to the
electromagnetic operation unit. In the electromagnetic valve, the
feeder unit includes a power receiving terminal which is provided
on a side surface of the electromagnetic valve body and conducted
to the electromagnetic operation unit, a terminal cover attached
onto the side surface of the electromagnetic valve body to cover
the power receiving terminal, a socket hole formed at a position
corresponding to the power receiving terminal covered by the
terminal cover, and a feeder socket attached to a top end of a
feeder cable so as to be installed within the socket hole. The
feeder socket includes a terminal storage box having a rectangular
box shape and an open front surface and a lid for covering the open
front surface of the terminal storage box, and the feeder cable and
a feeder terminal are interposed between the terminal storage box
and the lid which are connected with each other to integrally
assemble the feeder socket to be installed within the socket hole
such that the feeder terminal and the power receiving terminal are
electrically coupled with each other.
According to the preferred embodiment of the present invention,
semi-circular grooves are formed at opposite positions for
introducing the feeder cable on the terminal storage box and the
lid such that the feeder cable is gripped between the semi-circular
grooves.
According to the present invention, preferably a protrusion formed
at one of the terminal storage box and the lid is fixed to a fixing
window formed at the other one such that they are integrally
connected with each other. Specifically, preferably the terminal
storage box includes left and right elastically deformable side
walls and a plurality of fixing windows formed on the side walls,
and the lid is elastically fit with a portion between the left and
the right side walls such that a plurality of the protrusions
formed on both side surfaces of the lid are fixed to the fixing
windows.
Preferably, according to the present invention, at least one of a
plurality of walls that surround the socket hole is formed as an
elastic wall, and a hook is formed on an inner surface of the
elastic wall, a claw is formed on a plane opposite the elastic wall
such that the feeder socket is installed in the socket hole so as
not to be fallen out through an elastic engagement between the claw
and the hook.
More preferably, two opposite walls of the socket hole are formed
as the elastic walls, and the claws are formed on back surfaces of
the terminal storage box and the lid of the feeder socket,
respectively.
In this case, the elastic walls extend to a depth of the hole from
an end portion at an inlet side of the socket hole as a supporting
point, and an end portion at the depth side is made elastically
deformable to be close to or remote from the claws of the feeder
socket.
According to the present invention, a stepped portion may be formed
to surround a top end of the socket hole, and flange portions are
formed around an outer periphery of a top end of the feeder socket
such that the flange portions abut against the stepped portion to
be fixed upon insertion of the feeder socket into the socket
hole.
The above-described electromagnetic valve according to the present
invention allows the assembly of the feeder unit for supplying
power to the electromagnetic operation unit and its installment to
the electromagnetic valve to be simply performed. Especially,
unlike the generally employed feeder unit, assembly of the feeder
socket of the feeder unit and its connection to the electromagnetic
valve may be easily performed by gripping the feeder cable and the
feeder terminal linked therewith to be fixed between the terminal
storage box and the lid without external insertion thereof into the
hole or the cylinder formed in the socket.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a longitudinal sectional view of a first embodiment of
the present invention.
FIG. 2 is an exploded perspective view of the feeder socket.
FIG. 3 is an enlarged sectional view of an essential portion of the
view taken along line A-A of FIG. 1.
FIG. 4 is an enlarged sectional view of an essential portion shown
in FIG. 1.
FIG. 5 is a perspective view showing the state before assembly of
the feeder socket which has not been inserted into the insertion
hole of the terminal cover.
FIG. 6 is a perspective view showing the state where the feeder
socket has been assembled to be installed into the insertion hole
of the terminal cover.
FIG. 7 is a sectional view of the second embodiment according to
the present invention at the same position as shown in FIG. 4.
FIG. 8 is an exploded perspective view of the feeder socket of the
second embodiment when viewed from the lid.
FIG. 9 is an exploded perspective view of the feeder socket of the
second embodiment when viewed from the terminal storage box.
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described referring to
the drawings.
Referring to FIG. 1, an electromagnetic valve according to the
present invention is generally formed of an electromagnetic valve
body 1 including a passage switching unit 2 formed as a three-port
type directional switching valve and an electromagnetic operation
unit 3 for operating the passage switching unit, and a feeder unit
4 that supplies power to the electromagnetic operation unit 3.
The passage switching unit 2 includes a valve body 10 formed as a
substantially square block having its first side surface 10a
provided with a feed port P, an output port A, and a discharge port
R. The valve body 10 has a circular hole 13a that forms a valve
chamber 13 in the direction from an end surface 10c opposite the
end surface connected to the electromagnetic operation unit 3 to
the inside the valve body 10. A valve seat block 11 is fit with the
hole 13a to be fixed therein by a fixing plate 12 attached to the
end surface 10c. The valve chamber 13 defined by the valve seat
block 11 within the hole 13a is provided with a poppet type valve
body 14 so as to be reciprocally moved along the axial direction of
the hole 13a.
The valve seat block 11 includes a feed passage 15 that
communicates the feed port P with the valve chamber 13. Meanwhile,
the valve body 10 includes a discharge passage 16 that communicates
the discharge port R with the valve chamber 13. A feed valve seat
15a around the opening of the feed passage 15 is positioned
opposite a discharge valve seat 16a around the opening of the
discharge passage 16 within the valve chamber 13. The valve body 14
locates between those valve seats, and is held by an annular valve
holder 17. A plurality of push rods 18 are provided reciprocally
movable with a movable iron core 24 (described later) between the
valve holder 17 and the movable iron core 24. A valve spring 19 is
disposed between an annular groove around the feed valve seat 15a
and the valve body 14. The elastic force of the valve spring 19
urges the valve body 14 toward the discharge valve seat 16a.
An annular bobbin 25 is stored within a hollow magnetic cover 21
which has a circular or a rectangular cross section and one open
end portion of the electromagnetic operation unit 3. A coil 26 is
wound around the bobbin 25, and has both ends connected to a pair
of coil terminals 27 each protruding in parallel from the bobbin 25
to be fit within a terminal receiving hole 33 of the valve body 10.
FIG. 1 shows only one coil terminal connected to one end of the
coil 26, and does not show the other coil terminal and associated
members for feeding power. An inner hole 28 of the bobbin 25
includes a fixed iron core 29 in contact with an end wall portion
21a of the magnetic cover 21 and a movable iron core 24 which is
magnetically attracted to the fixed iron core 29 and allowed to
displace.
Within the aforementioned magnetic cover 21, a magnetic plate 30 is
interposed between the bobbin 25 and the valve body 10. An outer
periphery of the magnetic plate 30 abuts against the inner surface
of the magnetic cover 21 such that the magnetic cover 21 and the
magnetic plate 30 are magnetically connected with each other. The
inner hole of the magnetic plate 30 has the same diameter as that
of the inner hole 28 of the bobbin 25.
An annular synthetic resin cap 31 is fixed to a top end of the
movable iron core 24. A return spring 32 is interposed between a
flange-like spring washer at the top end of the cap 31 and the
annular groove of the magnetic plate 30.
The passage switching unit 2 is connected to the electromagnetic
operation unit 3 by calking a fixing portion 21b formed as a part
of the magnetic cover 21 so as to be fixed to a recess portion of
the valve body 10.
FIG. 1 shows the state where the coil 26 is not excited. In this
state, the return spring 32 which exhibits the spring force
stronger than that of the valve spring 19 urges the movable iron
core 24 toward the valve body 10 against the urging force of the
valve spring 19. The resultant urging force is transferred to the
valve body 14 via the push rods 18 and the valve holder 17 such
that the valve body 14 abuts the feed valve seat 15a of the valve
seat block 11 to be closed, and the discharge valve seat 16a is
opened. Accordingly, the communication between the feed port P and
the valve chamber 13 is interrupted, and the communication between
the output port A and the discharge port R is allowed.
When the coil 26 is excited through application of electric
current, the fixed iron core 29 generates the magnetic suction
force to allow the movable iron core 24 to be attracted thereto.
Then the valve body 14 opens the feed valve seat 15a, and closes
the discharge valve seat 16a. Accordingly, the communication
between the discharge port R and the valve chamber 13 is
interrupted, and the communication between the feed port P and the
output port A is allowed.
A rectangular hollow terminal storage portion 35 that protrudes
outward from the second side surface 10b is formed integrally with
the valve body 10 at a position near the electromagnetic operation
unit 3 on the second side surface 10b opposite the first side
surface 10a of the valve body 10 on which the ports P, A and R are
formed. The terminal storage portion 35 is formed at the position
corresponding to the top end portion of the coil terminal 27 that
extends parallel to the second side surface 10b, and provided with
two hollow portions 35a therein each reaching the corresponding
coil terminal 27. Each of the hollow portions 35a stores a first
relay terminal 37 electrically coupled with the corresponding coil
terminal 27.
The second side surface 10b of the valve body 10 and a side surface
3a of the electromagnetic operation unit 3 form a substantially
flat or a nearly flat single surface without a portion greatly
protruding outward except the terminal storage portion 35. The
surface allows a terminal mount surface 1a to be formed on the side
surface of the electromagnetic valve body 1. A terminal table 40 is
disposed on the terminal mount surface 1a, on which a substrate 41
is installed. A terminal cover 42 that covers the terminal table 40
and the substrate 41 is attached to the electromagnetic valve body
1.
Two power receiving terminals 38, 38 each top end of which
protrudes from the upper surface of the substrate 41 are fixed
thereto. The top end of the power receiving terminal 38 locates at
the inner bottom portion of a rectangular socket hole 70 that opens
to the upper surface of the terminal cover 42 at the position near
the center thereof. Each of the power receiving terminals 38 is
electrically coupled with each of two feeder terminals 36, 36
through plug-in within the feeder socket 45 installed in the socket
hole 70, respectively. Two second relay terminals 39, 39 each top
end of which protrudes downward to the valve body 10 are fixed to
the substrate 41. Each of the second relay terminals 39 is
electrically coupled with the first relay terminal 37 within the
terminal storage portion 35, respectively. The second relay
terminal 39 has its top end connected to the first relay terminal
37 through plug-in when the substrate 41 is installed to the
terminal table 40 parallel to the terminal mount surface 1a.
Electronic parts required for controlling current application are
fixed to the substrate 41, through which the power receiving
terminals 38 and the second relay terminals 39 are electrically
coupled with one another.
Referring to FIGS. 1 and 5, the terminal cover 42 has a size
corresponding to the area defined by the passage switching unit 2
and the electromagnetic operation unit 3 to cover the terminal
mount surface 1a entirely, and is fixed to the valve body 10 with a
cover fixing screw 43. Trough holes formed in the terminal cover
42, the terminal table 40, and the valve body 10 allow two screws
44 for fixing the electromagnetic valve to be inserted therethrough
for attaching the electromagnetic valve to the manifold and the
like.
The feeder socket 45 inserted into the socket hole 70 will be
described referring to FIGS. 1 to 6.
Referring to FIG. 2, the feeder socket 45 includes a separate type
housing 46 formed of a rectangular box-shape terminal storage box
47 having an open front surface and a rectangular lid 48 that
closes the open front surface of the terminal storage box 47, and
two feeder terminals 36, 36 stored within the housing 46 and
connected to the respective feeder cables 49. The top end of the
feeder cable 49 is gripped by a holder arm 36a at the base of the
feeder terminal 36. A conducting core wire 50 of the feeder cable
49 is electrically coupled with the core wire grip portion 36b of
the feeder terminal 36 at the position adjacent to the holder arm
36a. One side surface of the top end of the feeder terminal 36,
that is, the side surface that faces the terminal storage box 47 is
integrally provided with a terminal connector 36c formed of a
substantially cylindrical elastic clip. The other side surface,
that is, the side surface that faces the lid 48 is integrally
provided with a fixing portion 36d that diagonally protrudes toward
the base portion of the feeder terminal. A stepped fixing portion
48b to which the fixing portion 36d is fixed is formed on an inner
surface 48a of the lid 48 as shown in FIG. 4. The feeder terminal
36 may be prevented from falling out of the housing 46 by fixing
the fixing portion 36d to the stepped fixing portion 48b.
The terminal storage box 47 includes two terminal storage chambers
54, 54 each having a recess groove shape adjacent with each other
therein. The feeder terminals 36 connected to the feeder cables 49
are fixed within the storage chambers 54 each extending in the
vertical direction. A terminal through hole 77 is formed in each
bottom portion of the respective storage chambers 54. The power
receiving terminal 38 is inserted into the storage chamber 54
through the through hole 77 such that the power receiving terminal
38 is electrically coupled with the terminal connector 36c of the
feeder terminal 36 through plug-in.
Guide portions 55 and 61 each including two semi-circular grooves
55a, 55a and 61a, 61a, respectively with which the feeder cables 49
are fit are integrally formed at the position where each top end of
the terminal storage box 47 and the lid 48 faces with each other.
The top end of the feeder cable 49 is fit and gripped between the
opposing semi-circular grooves 55a and 61a.
Referring to FIG. 2, two fixing windows 59, 59 are formed at the
upper and the lower portions of the left and right side walls 58 of
the terminal storage box 47, respectively. Meanwhile, two
protrusions 63 (protrusion 63 on one side surface is only shown)
elastically fixed to the fixing windows 59 of the terminal storage
box 47 are formed at the upper and the lower portions of the left
and right side walls of the lid 48, respectively. Those fixing
windows 59 and the protrusions 63 form a fixing mechanism that
fixes the terminal storage box 47 and the lid 48 in the assembly
state.
In order to install those two feeder terminals 36, 36 to which the
feeder cables 49 are connected in the housing 46, firstly, the
feeder terminals 36 are stored in the storage chamber 54 of the
terminal storage box 47, and the feeder cables 49 are fit with the
respective semi-circular grooves 55a. Then the left and the right
side surfaces 62 of the lid 48 are fit between both side walls 58,
58 at the side of the opening of the terminal storage box 47 such
that the lid 48 is strongly pushed inward of the terminal storage
box 47. As the side walls 58 of the terminal storage box 47 and the
side surfaces 62 of the lid 48 are elastically deformed, and the
protrusions 63 of the lid 48 move in contact with the inner
surfaces of the side walls 58, the four protrusions 63 are fixed to
the four fixing windows 59, respectively.
The housing 46 to be inserted into the socket hole 70 formed in the
terminal cover 42 is assembled in the state where the feeder cables
49 and the feeder terminals 36 are gripped to be fixed between the
terminal storage box 47 and the lid 48.
It is possible to provide the protrusions 63 on the side walls 58
of the terminal storage box 47, and to provide the fixing windows
59 on the side surfaces 62 of the lid 48.
A convex portion 65 and a first claw 66 raised from the back
surface 64 of the lid 48 at a predetermined height are provided at
the upper and the lower portions of the back surface 64. A recess
portion 66a is defined by the convex portion 65 and the first claw
66. The outer surfaces of the lower portion of both side walls 58
of the terminal storage box 47 are integrally provided with second
claws 67.
Referring to FIG. 4, one of four walls of the rectangular socket
hole 70 formed in the terminal cover 42, which is opposite the back
surface 64 of the lid 48 of the housing 46 is formed as a first
elastic wall 74 that extends to the depth of the hole from the
upper end at the side of an inlet as the supporting point such that
the lower end at the depth side is deformable to be close to or
remote from the lid 48. A first hook 71 that protrudes inward of
the hole, that is, toward the lid 48 is formed at the lower end
portion of the first elastic wall 74. Referring to FIG. 3, two
walls each orthogonal to the first elastic wall 74, that is,
opposite the side walls 58, 58 of the terminal storage box 47 are
formed as second elastic walls 76, 76 which are elastically
deformable likewise the first elastic wall 74. Second hooks 75 each
protruding inward of the hole are formed at the lower portions of
the second elastic walls 76, respectively.
In order to install the above-structured feeder socket 45 in the
socket hole 70, the back surface 64 of the lid 48 of the housing 46
is directed to face the first elastic wall 74 of the socket hole 70
(see FIGS. 4 and 5), and the side wall 58 of the terminal storage
box 47 is directed to face the second elastic wall 76 of the socket
hole 70 (see FIGS. 3 and 5). In the aforementioned state, the
feeder socket 45 is inserted into the socket hole 70. Then the
first claw 66 formed on the back surface 64 of the lid 48 presses
the first hook 71 of the first elastic wall 74 to be elastically
deformed outward, and the second claw 67 formed on the side wall 58
of the terminal storage box 47 presses the second hook 75 formed on
the second elastic wall 76 to be elastically deformed outward.
Accordingly in the feeder socket 45, the first and the second claws
66 and 67 stride over the first and the second hooks 71 and 75,
respectively to be pushed to the position at which the respective
lower surfaces are fixed. The claws 66 and 67 are fixed to the
hooks 71 and 75, respectively at the fixed positions.
The first and the second hooks 71 and 75 each formed on the wall of
the socket hole 70, and the first and the second claws 66 and 67
formed on the housing 46 constitute the socket fixing mechanism for
fixing the feeder socket 45 in the socket hole 70.
Both pairs of the first claw 66 and the first hook 71, and the
second claw 67 and the second hook 75 do not have to be formed. It
is allowed to provide any one of those pairs.
A protruding frame 72 that protrudes upward from the upper surface
of the terminal cover 42 is integrally formed with the portion
around the socket hole 70 in the upper surface of the terminal
cover 42. A stepped portion 73 is formed on the inner periphery of
the protruding frame 72 to surround the upper end portion of the
socket hole 70. Meanwhile, flange portions 57 and 60 are formed on
the outer periphery of the upper end portion of the feeder socket
45 to stride over the terminal storage box 47 and the lid 48. In
the aforementioned state, when the feeder socket 45 is inserted
into the socket hole 70, those flange portions 57 and 60 abut on
the stepped portion 73 so as to be fixed. Fixation of the claws 66
and 67 to the hooks 71 and 75 in the aforementioned state prevents
the feeder socket 45 from falling out. In this way, the feeder
socket 45 is installed into the socket hole 70 such that the power
receiving terminals 36 within the feeder socket 45 are connected to
the power receiving terminals 38 of the substrate 41 so as to be
conducted.
A reference numeral 78 in the drawings denotes a positioning plate
to be inserted into the groove of the substrate 41.
Once the feeder socket 45 is installed into the socket hole 70,
generally it cannot be pulled out from the socket hole 70. However,
it is possible to pull out the feeder socket 45 by removing the
terminal cover 42 from the electromagnetic valve body 1, and
disengaging the hooks 71, 75 from the claws 66, 67 by deforming the
respective elastic walls 74, 76 from the lower surface using such
tool as a screwdriver.
FIGS. 7 to 9 show a second embodiment of the feeder unit. The main
characteristic of a feeder unit 4A according to the second
embodiment, which is different from the feeder unit 4 according to
the first embodiment will be described hereinafter. In the feeder
unit 4 according to the first embodiment, the claws 66, 67 are
formed on three surfaces, that is, the back surface 64 of the lid
48 and left and right side walls 58 of the terminal storage box 47,
which form the housing 46 of the feeder socket 45, three walls of
the socket hole 70 are formed as the elastic walls 74, 76 including
the hooks 71, 75, respectively, and fixation of those claws 66, 67
to the hooks 71, 75 may fix the feeder socket 45 to the socket hole
70 at three planes. Meanwhile, in the feeder unit 4A according to
the second embodiment, the feeder socket 45 is fixed to the socket
hole 70 at two planes, that is, the back surface of the terminal
storage box 47 and the back surface of the lid 48, which form the
housing 46.
Specifically, the two first claws 66 are laterally arranged at a
predetermined interval at the lower end of the back surface 64 of
the lid 48. Two convex portions 65 are formed above those first
claws 66. The recess portion 66a is defined by the upper convex
portions 65 and the lower first claws 66. As described above, two
third claws 68 are laterally arranged at a predetermined interval
at the lower end of the back surface of the terminal storage box
47. The convex portions 69 are formed above the third claws 68. The
recess portion 68a is defined by the third claws 68 and the convex
portions 69.
Two opposite walls of the four walls that surround the socket hole
70 formed in the terminal cover 42, that is, the wall near the back
surface 64 of the lid 48 of the feeder socket 45, and the wall near
the back surface of the terminal storage box 47 are formed as the
first and the third elastic walls 74 and 79, respectively each
having the first and the third hooks 71 and 80 at the lower
end.
When the feeder socket 45 is pushed into the socket hole 70, the
first and the third hooks 71 and 80 at the lower ends of the first
and the third elastic walls 74 and 79 are elastically widened
temporarily by the first and the third claws 66 and 68. They are
elastically fit with the recess portions 66a and 68a, respectively
to be fixed to the lower ends of the first and the third claws 66
and 68. This allows the feeder socket 45 to be installed in the
socket hole 70 in the fixed state.
The structures of the feeder socket 45 and the terminal cover 42
according to the second embodiment other than those described are
substantially the same as those of the feeder socket 45 and the
terminal cover 42 according to the first embodiment. The same main
components as those of the first embodiment will be designated with
the same reference numerals, and the explanations thereof, thus,
will be omitted.
The feeder socket 45 may be fixed at any one of a plurality of
planes without being fixed in the socket hole 70 at the plurality
of planes as described in the respective embodiments. That is, any
one of those walls of the socket hole 70 may be formed as the
elastic wall to constitute the hook, and a claw may be formed on
the outer surface of the feeder socket 45 opposite the elastic
wall.
* * * * *